This photo shows Amazon Local Register, the company’s new credit-card processing device and mobile app designed to help small business owners accept payments through their smartphones and tablets.

NEW YORK — Amazon is taking direct aim at mobile payment systems such as Square by introducing the Amazon Local Register, a credit-card processing device and mobile app designed to help small business owners accept payments through their smartphones and tablets.

The move places the largest U.S. e-commerce retailer in competition with Square and other established mobile payment processing systems such as PayPal Here and Intuit’s GoPayment.

Amazon’s technology includes a card reader that attaches to a smartphone, Kindle or tablet. The reader processes credit or debit card payments via a secure Amazon network, the same one that processes Amazon.com purchases. The service is designed to serve on-the-go small business owners who might otherwise only accept cash or checks, including massage therapists, food truck operators and artists who sell their work at outdoor fairs.

Small businesses can start using Local Register by creating an account on http://localregister.amazon.com. Businesses must buy Amazon’s card reader for $10, and download the free mobile app from the Amazon app store, the Apple app store or Google Play. The app works on most smartphones and tablets, including Kindle Fire.

Similar to Amazon’s strategy in many of its businesses, the company aims to compete on price in the mobile payment arena. For customers who sign up for the service by Oct. 31, Amazon will take as its fee 1.75 percent of each payment processed, or each “swipe” of the card, a special rate that will last until Jan. 1, 2016. For people who sign up after Oct. 31, Amazon will take a service fee of 2.5 percent of each payment processed.

The first $10 in transaction fees will be credited back to the customer, essentially paying for the card reader.

That’s below most of its competitors’ rates. Square takes a fee of 2.75 percent of each transaction. PayPal Here takes 2.7 percent of each transaction and Intuit’s GoPayment rates start at 1.75 percent per transaction if businesses pay a $19.95 monthly rate or 2.4 percent of each transaction without a monthly payment.

“I’ve actually heard some business owners say the only thing that would make them change (point of sale) systems is cost savings,” said Matt Swann, vice president of local commerce for Amazon.

“Payments are hard and that’s one of the things that gets in the way of serving customers, especially for small businesses,” Swann said. “Payment tools need to be inexpensive, simple and trusted to get the job done.”

Amazon is entering the mobile payment space as the industry continues its rapid growth. IDC estimates that mobile payments could top a trillion dollars globally within the next five years. That includes all forms of mobile payments, such as items purchased online via a phone or tablet, fund transfers and items bought using a mobile gadget as a payment-accepting device.

It’s difficult to isolate the exact portion of that market represented by point-of-sale mobile commerce, since the biggest player, Square, is private and doesn’t divulge sales. Also, PayPal doesn’t break out specific revenue from its Here product.

Baird Equity analyst Colin Sebastian said Amazon’s move was partly expected since the company bought mobile payment company GoPago in 2013.

“The announcement suggests the lines between commerce and payment platforms continue to blur, and we still anticipate other large technology players (like Google and Apple) to expand their own existing payment initiatives, including in-store point-of-sale services.”